Add comments

apps/openmw/mwmechanics/spellcasting.cpp

@@ -543,6 +543,7 @@ namespace MWMechanics
 
                     std::string texture = "";
 
+                    // Use particle textures for non-harmful effects
                     if (!magicEffect->mParticle.empty() && !(magicEffect->mData.mFlags & ESM::MagicEffect::Harmful))
                         texture = magicEffect->mParticle;
 

apps/openmw/mwworld/projectilemanager.cpp

@@ -74,7 +74,8 @@ namespace
         if (count != 0)
             speed /= count;
 
-        if (projectileEffects.mList.size() == 1)
+        // in the original engine, the particle texture is only used if there is only one projectile
+        if (projectileEffects.mList.size() == 1) 
         {
             const ESM::MagicEffect *magicEffect = MWBase::Environment::get().getWorld()->getStore().get<ESM::MagicEffect>().find (
                 effects.mList.begin()->mEffectID);