diff --git a/fxconv/fxconv-main.py b/fxconv/fxconv-main.py
index b5e4337..eea828c 100755
--- a/fxconv/fxconv-main.py
+++ b/fxconv/fxconv-main.py
@@ -30,8 +30,8 @@ syntax (names can contain dots). For example:
   fxconv -f myfont.png -o myfont.o charset:ascii grid.padding:1 height:7
 
 Some formats differ between platforms so you should specify it when possible:
-  --fx, --fx9860G  Casio fx-9860G family (black-and-white calculators)
-  --cg, --fxCG50   Casio fx-CG 50 family (16-bit color calculators)
+  --fx   Casio fx-9860G family (black-and-white calculators)
+  --cg   Casio fx-CG 50 family (16-bit color calculators)
 """.strip()
 
 # Simple error-warnings system
diff --git a/fxconv/fxconv.py b/fxconv/fxconv.py
index 2937a94..0a0d310 100644
--- a/fxconv/fxconv.py
+++ b/fxconv/fxconv.py
@@ -1100,7 +1100,7 @@ def elf(data, output, symbol, toolchain=None, arch=None, section=None,
 		os.remove(fp_asm.name + ".o")
 
 		if proc.returncode != 0:
-			raise FxconvError("ld returned {proc.returncode}")
+			raise FxconvError(f"ld returned {proc.returncode}")
 
 		fp_asm.close()