Document --low-graphics option in SUG

Stellarium · Jan 28, 2024 · cfdfc7d · cfdfc7d
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diff --git a/guide/ch_advanced_use.tex b/guide/ch_advanced_use.tex
@@ -543,6 +543,7 @@ \chapter{Command Line Options}
 -\/-mesa-mode or -m  & {[}none{]} & Use MESA as software OpenGL rendering engine.\footnotemark[1]\\
 -\/-single-buffer    & {[}none{]} & Use single-buffering. This reportedly avoids screen blanking problems with some Intel GPUs. \\
 -\/-opengl-compat or -C & {[}none{]} & Request OpenGL 3.3 Compatibility Profile. Might fix graphics problems in some driver configurations.\\
+-\/-low-graphics or -L & {[}none{]} & Force low-graphics mode. May be useful on old GPUs that do support OpenGL 3.3 but perform too slowly.\\
 \bottomrule
 \end{longtable}