More stuff

docs/syntax.md

@@ -134,7 +134,7 @@ Appends an item to a list.
 
 Usage: `listappend *list $var`
 
-### String Operations (ALL WORK IN PROGRESS)
+### String Operations
 
 #### getstrsize
 
@@ -200,7 +200,7 @@ Checks if the left value is lesser than the right value. Outputs a boolean to a
 
 Usage: `lesser $value $value &var`
 
-### Type Conversions
+### Type Conversions (ALL WORK IN PROGRESS)
 
 #### stoi
 
@@ -248,6 +248,24 @@ Usage: `pusharg $value`
 
 #### call
 
-Calls a function, with all the arguments in the argument list.
+Calls a function, with all the arguments in the argument list. The return value will be put in the specified variable.
 
-Usage: `call !function`
+Usage: `call !function &var
+
+### Interacting with Libraries (ALL WORK IN PROGRESS)
+
+#### use
+
+Attempts to import another Ground program. Gets inserted wherever the use statement is. Any code (including code outside function declarations) will be executed. 
+
+Note: Ground will check the directory where the program is stored when trying to find imported programs. If that fails, it will check the directory set in the $GROUND_PATH environment variable set by your system. The '.grnd' extension is appended automatically.
+
+Usage: `use $stringvalue`
+
+#### extern
+
+Attempts to import a shared object library written for Ground. All functions in the external library will be usable with `call`.
+
+Note: Ground will check the directory where the program is stored when trying to find external programs. If that fails, it will check the directory set in the $GROUND_PATH environment variable set by your system. The '.so', '.dll', etc  extension is appended automatically.
+
+Usage: `extern $stringvalue`