diff --git a/src/PROFILE.md b/src/PROFILE.md
index e6ffa96..e0cdb9d 100644
--- a/src/PROFILE.md
+++ b/src/PROFILE.md
@@ -6,7 +6,7 @@ Performance Tools) for profiling. Note, we also considered using
 comparison. This will not tell you how long (wall clock time) each function
 took, but it will help you determine which functions are the most expensive.
 
-## Prequisities
+## Prerequisites
 
 On Linux (Debian), you need to install:
 ```
@@ -33,7 +33,7 @@ human-friendly graph that generated from that profiling data.
 
 #### Errors on macOS
 
-Note, on macOS there may a lot of "errors" like:
+Note, on macOS there may be a lot of "errors" like:
 ```
 otool-classic: can't open file: /usr/lib/libc++.1.dylib
 ```
@@ -78,4 +78,4 @@ my_func 189 (0.6%) of 28758 (96.8%)
 * 189 is the number of profiling samples in this function.
 * 0.6% is the percentage of profiling samples in the functions.
 * 28758 is the number of profiling samples in this function and its callees.
-* 96.8% is the percentage of profiling samples in this function and its callees.
\ No newline at end of file
+* 96.8% is the percentage of profiling samples in this function and its callees.