Format Compiler and linker flag table [skip ci]
diff --git a/docs/markdown/Reference-tables.md b/docs/markdown/Reference-tables.md
index 0de1893..fa913f5 100644
--- a/docs/markdown/Reference-tables.md
+++ b/docs/markdown/Reference-tables.md
@@ -117,6 +117,8 @@
 These environment variables will be used to modify the compiler and
 linker flags.
 
+| Name      | Comment                                  |
+| -----     | -------                                  |
 | CFLAGS    | Flags for the C compiler                 |
 | CXXFLAGS  | Flags for the C++ compiler               |
 | OBJCFLAGS | Flags for the Objective C compiler       |