diff --git a/etc/cshrc b/etc/cshrc
index e9d885048..73116ff49 100644
--- a/etc/cshrc
+++ b/etc/cshrc
@@ -120,7 +120,7 @@ setenv WM_COMPILER_LIB_ARCH
 # WM_ARCH_OPTION = 32 | 64
 if ( ! $?WM_ARCH_OPTION ) setenv WM_ARCH_OPTION 64
 
-# WM_PRECISION_OPTION = DP | SP
+# WM_PRECISION_OPTION = LDP | DP | SP
 if ( ! $?WM_PRECISION_OPTION ) setenv WM_PRECISION_OPTION DP
 
 # WM_COMPILE_OPTION = Opt | Debug | Prof