diff --git a/README.md b/README.md
index 88a3b55f..0426f3e9 100644
--- a/README.md
+++ b/README.md
@@ -318,7 +318,7 @@ and `\]`. For example:
 Inline equations are delimited by `\(` and `\)`. These equations will appear
 inline with regular text. For example:
 
-    The Pythagorean theorum is \( a^2 + b^2 = c^2 \).
+    The Pythagorean theorem is \( a^2 + b^2 = c^2 \).
 
 Gollum uses [MathJax](http://www.mathjax.org/) to convert the TeX syntax into
 output suitable for display in web browsers.