diff --git a/doc/standard_library.rdoc b/doc/standard_library.rdoc
index 6aba37dbfa..d97e09e977 100644
--- a/doc/standard_library.rdoc
+++ b/doc/standard_library.rdoc
@@ -102,7 +102,7 @@ Psych:: A YAML parser and emitter for Ruby
 PTY:: Creates and manages pseudo terminals
 Readline:: Provides an interface for GNU Readline and Edit Line (libedit)
 Ripper:: Provides an interface for parsing Ruby programs into S-expressions
-SBDM:: Provides a simple file-based key-value store with String keys and values
+SDBM:: Provides a simple file-based key-value store with String keys and values
 Socket:: Access underlying OS socket implementations
 StringIO:: Pseudo I/O on String objects
 StringScanner:: Provides lexical scanning operations on a String