diff --git a/c/qrcodegen.h b/c/qrcodegen.h
index 70b1ce8..3215a6c 100644
--- a/c/qrcodegen.h
+++ b/c/qrcodegen.h
@@ -84,12 +84,12 @@ enum qrcodegen_Mode {
  * bit length is 32767, because even the largest QR Code (version 40) has only 31329 modules.
  */
 struct qrcodegen_Segment {
-	// The mode indicator for this segment.
+	// The mode indicator of this segment.
 	enum qrcodegen_Mode mode;
 	
-	// The length of this segment's unencoded data, measured in characters for
+	// The length of this segment's unencoded data. Measured in characters for
 	// numeric/alphanumeric/kanji mode, bytes for byte mode, and 0 for ECI mode.
-	// Always zero or positive.
+	// Always zero or positive. Not the same as the data's bit length.
 	int numChars;
 	
 	// The data bits of this segment, packed in bitwise big endian.
diff --git a/cpp/QrSegment.hpp b/cpp/QrSegment.hpp
index 4f56e97..47c41b0 100644
--- a/cpp/QrSegment.hpp
+++ b/cpp/QrSegment.hpp
@@ -139,15 +139,16 @@ class QrSegment final {
 	
 	/*---- Instance fields ----*/
 	
-	/* The mode indicator for this segment. */
+	/* The mode indicator of this segment. Accessed through getMode(). */
 	private: Mode mode;
 	
-	/* The length of this segment's unencoded data, measured in characters for
+	/* The length of this segment's unencoded data. Measured in characters for
 	 * numeric/alphanumeric/kanji mode, bytes for byte mode, and 0 for ECI mode.
-	 * Always zero or positive. */
+	 * Always zero or positive. Not the same as the data's bit length.
+	 * Accessed through getNumChars(). */
 	private: int numChars;
 	
-	/* The data bits of this segment. */
+	/* The data bits of this segment. Accessed through getData(). */
 	private: std::vector<bool> data;
 	
 	
diff --git a/java/io/nayuki/qrcodegen/QrSegment.java b/java/io/nayuki/qrcodegen/QrSegment.java
index 251d1a1..605ab71 100644
--- a/java/io/nayuki/qrcodegen/QrSegment.java
+++ b/java/io/nayuki/qrcodegen/QrSegment.java
@@ -156,15 +156,15 @@ public final class QrSegment {
 	
 	/*---- Instance fields ----*/
 	
-	/** The mode indicator for this segment. Never {@code null}. */
+	/** The mode indicator of this segment. Not {@code null}. */
 	public final Mode mode;
 	
-	/** The length of this segment's unencoded data, measured in characters for
+	/** The length of this segment's unencoded data. Measured in characters for
 	 * numeric/alphanumeric/kanji mode, bytes for byte mode, and 0 for ECI mode.
-	 * Always zero or positive. */
+	 * Always zero or positive. Not the same as the data's bit length. */
 	public final int numChars;
 	
-	/** The data bits of this segment. Accessed through {@link getBits()}. Not {@code null}. */
+	/** The data bits of this segment. Not {@code null}. Accessed through {@link getBits()}. */
 	final BitBuffer data;
 	
 	
diff --git a/javascript/qrcodegen.js b/javascript/qrcodegen.js
index afa2ba3..f54d9a4 100644
--- a/javascript/qrcodegen.js
+++ b/javascript/qrcodegen.js
@@ -710,12 +710,12 @@ var qrcodegen = new function() {
 			throw "Invalid argument";
 		bitData = bitData.slice();  // Make defensive copy
 		
-		// The mode indicator for this segment.
+		// The mode indicator of this segment.
 		Object.defineProperty(this, "mode", {value:mode});
 		
-		// The length of this segment's unencoded data, measured in characters for
+		// The length of this segment's unencoded data. Measured in characters for
 		// numeric/alphanumeric/kanji mode, bytes for byte mode, and 0 for ECI mode.
-		// Always zero or positive.
+		// Always zero or positive. Not the same as the data's bit length.
 		Object.defineProperty(this, "numChars", {value:numChars});
 		
 		// Returns a copy of all bits, which is an array of 0s and 1s.
diff --git a/python/qrcodegen.py b/python/qrcodegen.py
index debc3a4..8a9fc37 100644
--- a/python/qrcodegen.py
+++ b/python/qrcodegen.py
@@ -688,12 +688,13 @@ class QrSegment(object):
 		if numch < 0:
 			raise ValueError()
 		
-		# The mode indicator for this segment.
+		# The mode indicator of this segment. Accessed through get_mode().
 		self._mode = mode
 		
-		# The length of this segment's unencoded data, measured in characters for
+		# The length of this segment's unencoded data. Measured in characters for
 		# numeric/alphanumeric/kanji mode, bytes for byte mode, and 0 for ECI mode.
-		# Always zero or positive.
+		# Always zero or positive. Not the same as the data's bit length.
+		# Accessed through get_num_chars().
 		self._numchars = numch
 		
 		# The data bits of this segment. Accessed through get_bits().
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
index ca74cf7..33c73c2 100644
--- a/rust/src/lib.rs
+++ b/rust/src/lib.rs
@@ -833,14 +833,15 @@ impl ReedSolomonGenerator {
 #[derive(Clone)]
 pub struct QrSegment {
 	
-	// The mode indicator for this segment.
+	// The mode indicator of this segment. Accessed through mode().
 	mode: QrSegmentMode,
 	
-	// The length of this segment's unencoded data, measured in characters for
+	// The length of this segment's unencoded data. Measured in characters for
 	// numeric/alphanumeric/kanji mode, bytes for byte mode, and 0 for ECI mode.
+	// Not the same as the data's bit length. Accessed through num_chars().
 	numchars: usize,
 	
-	// The bits of this segment.
+	// The data bits of this segment. Accessed through data().
 	data: Vec<bool>,
 	
 }
diff --git a/typescript/qrcodegen.ts b/typescript/qrcodegen.ts
index a587360..b831050 100644
--- a/typescript/qrcodegen.ts
+++ b/typescript/qrcodegen.ts
@@ -742,14 +742,15 @@ namespace qrcodegen {
 		// The character count (numChars) must agree with the mode and the bit buffer length,
 		// but the constraint isn't checked. The given bit buffer is cloned and stored.
 		public constructor(
-				// The mode indicator for this segment.
+				// The mode indicator of this segment.
 				public readonly mode: QrSegment.Mode,
 				
-				// The length of this segment's unencoded data, measured in characters for
+				// The length of this segment's unencoded data. Measured in characters for
 				// numeric/alphanumeric/kanji mode, bytes for byte mode, and 0 for ECI mode.
-				// Always zero or positive.
+				// Always zero or positive. Not the same as the data's bit length.
 				public readonly numChars: int,
 				
+				// The data bits of this segment. Accessed through getBits().
 				private readonly bitData: Array<bit>) {
 			
 			if (numChars < 0)